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<table width="100%" summary="page for roller"><tr><td>roller</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Lawn Roller Data</h2>

<h3>Description</h3>

<p>The <code>roller</code> data frame has 10 rows and 2 columns.
Different weights of roller were rolled over different parts
of a lawn, and the depression was recorded.
</p>


<h3>Usage</h3>

<pre>roller</pre>


<h3>Format</h3>

<p>This data frame contains the following columns:
</p>

<dl>
<dt>weight</dt><dd><p>a numeric vector consisting of the roller weights</p>
</dd>
<dt>depression</dt><dd><p>the depth of the depression made in the grass
under the roller</p>
</dd>
</dl>



<h3>Source</h3>

<p>Stewart, K.M., Van Toor, R.F., Crosbie,
S.F. 1988. Control of grass grub (Coleoptera: Scarabaeidae) with
rollers of different design. N.Z. Journal of Experimental Agriculture
16: 141-150.
</p>


<h3>Examples</h3>

<pre>
plot(roller)
roller.lm &lt;- lm(depression ~ weight, data = roller)
plot(roller.lm, which = 4)
</pre>


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